Hi dezirain, welcome! This place is THE place to come looking to learn about anything e-cig related. The members are fantastic and I try to pitch in when I can.
I've been using tanks for about 9 months and just burnt a carto over the weekend, so don't feel bad. I think it's the 2nd time I've done it and I felt like an idiot... mostly because I was out of town and had no spare cartos so I was forced to use that one until I got home. I got myself in a hurry and didn't dry hit as much as I should have. My punishment was having to use the burnt-marshmallow flavored carto for a day. Thankfully, as soon as I got the burnt taste and smell I put more juice in the top, dry hit it again and most of the burnt smell and taste went away rather quickly (an hour or so). So if you catch it quickly enough it can be somewhat salvaged but not perfect. I still got a little burnt taste now and then but the Red Energy juice was potent enough to knock most of it out. :)
My biggest problem with tanks is accidentally grabbing my Cafe Mocha juice instead of Red Energy (since they're both red) when topping off my tank. Just did it this morning. My drive to work is about an hour and right about the time I got to work I started getting that Cafe Mocha coffee taste mixing in with my Red Energy. I swore at myself and now a new Red Energy carto is being filled on my desk as I type. I'm doing it the slow way (4-5 drops at a time every 5 minutes until the air holes at the bottom show red) since I only have the one tank that is currently full of Red Cafe Energy Mocha so I can't dry hit it. The adventure never ends. :)